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I have a problem with Matlab Coder. I would like to generate C code from Matlab interpolating function pchip. I verified the function with coder.screener and it says it's available for code generation but when I try to build pchip.m file I get this error:

The function 'pchip' is not supported for standalone code generation. See the documentation for coder.extrinsic to learn how you can use this function in simulation.

Can anyone help me? I really need to convert this function in C for a program I am writing.

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Limitations of pp = pchip(x,y) for code generation from the documentation:

  • Input x must be strictly increasing.
  • Does not remove y entries with NaN values.
  • If you generate code for the pp = pchip(x,y) syntax, you cannot input pp to the ppval function in MATLAB. To create a MATLAB pp structure from a pp structure created by the code generation software:
    • In code generation, use unmkpp to return the piecewise polynomial details to MATLAB.
    • In MATLAB, use mkpp to create the pp structure.

So, please check that you fulfill the previous points; especially the last one. You have examples in the documentation of how to make/unmake a picewise polynomial.

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Code generation support for pchip was added in R2014a mathworks.com/help/coder/release-notes.html so if you are using a release before that you may consider upgrading.
Thank you very much libill39 that was it! The solution was upgrading to r2014.

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